Furnace-roof construction



Aug- 13, 1929. J. D. MaCKENzIE ET AL 1,724,098v

FURNACE ROOF CONSTRUCTION Filed Apri] 2, '1927 f fngu Suva/niais Fatented Aug. i3, 1929.

MNVTED STATES l tutti@ Partnr ori-ica JHN' DUGLAS MAQKENZIE AND RICHARD W. SENGER, 0F GARFIELI, UTAH, AS-

SIGNORS T0 .AMERICAN SMELTING AND REFINING COMPANY, 0F NEW YORK, N. Y.,

. ORPUIRAATION 0F NEW JERSEY.

FURNACE-ROOF CONSTRUCTIN.

Application led April 2. 1927.- Serial No. 1330,412.

This invention relates to furnace roofs,

and, more particularlyfto a roof construction for reverberatory furnaces having means for absorbing heat from the refractory lining thereof.

The invention relates more specifieally'to a roof construction comprising a plurality of water cooled blocks which may be independently positioned and supported, the blocks being provided with downwardly extending metallic web-like members or iins between which the refractory lining is secured.

Various other features and advantages of the invention will be apparent from the following particular description' and from an inspection of the accompanying drawings,

Due to the excessive heat in the interior of a reverberatory furnace and particularly over the hearths of such furnaces, the refractory lining is subject to considerable wear which results in comparatively rapid disintegration'of the surface portion thereof.' `When the disintegration has proceeded to such an extent that the thickness of the lining is reduced below the required point, the roof must either be renewed or repaired with the consequent withdrawal of the furnace from active service. i

lin order to minimize as far as possible the erosion of the lining and to reduce the freque-ncy of the periods during which the furnace must be withdrawn from use for thepurpose of making repairs, it is desirable to provide a means for absorbing heat from the lining material at a sutiicient rate to prevent the surface from becoming excessively hot. Ilhis is accomplished in accordance with the present invention by providing a water cooled casting adapted to be suitably positioned to cover the entire roof of the furnace and having downwardly extending weblike members formed integral therewith. rfhe weblike members are adapted to extend between the various refractory brick forming the lining of the roof and to rapidly conduct heat away from the adjacent portions thereof to the metallic casting itself wherein the heat is absorbed a circulating cooling medium. rllhe above described castings are formed in comparatively small blocks which may be selfsupporting in the form of an a'rch or, if desired, may be mechanically sup-ported by an external strengthening member.

Although the novel features which are believed to be characteristic of this invention will be particularly pointed out in the claims appended hereto, the invention itself, as to its objects and advantages, lthe inode of its operation and the manner of its organization may be better understood by referring to the following description` taken in connection with the accompanying drawings forming a part thereof, in which Fig. l is a plan view of a water cooled block constructed in accordance with this invention;

Fig. 2 is a broken bottom view thereof showing the location of the cooling fins;

Fig. 3 is a section taken on the line 3--3 of Fig. 1 and Fig. l is a broken sectional view of a reverberatory furnace having a roofcomposed-V In the following description and in thev claims parts will be identified by specific names for convenience, but they are intended to be as generic intheir application to similar parts as the art will permit.

Referring to the figures more in detail the invention is shown as comprising a metallic casting 10, of copper or other material having a high co-eicient of heat transmission, in which are embedded coiled pipes having upstanding end portions 12 to facilitate external connections thereto. Supporting rings 13 may be embedded ing casting l0 and rigidly secured thereto in any suitable manner, such as by being cast therein.

A plurality of radiating fins 14C of the same metal as casting l0 are formed integral therewith and are suitably spaced to receive the desired refractory material such as tile or brick 15. Casting l0 may be formed slightly wedge-shaped to provide the usual arch construction although the bricks or tiles employed are preferably rectangular in form so that when a plurality of blocks vare positioned to form an arch the increased pressure on the lower portion thereof will serve to hold the various brick or tile in firm engagement with tins let and preventthe former from being displaced downwardly after the completed roof has been installed.

As shown in d a plurality of sections 10 may be positioned side by side to form from rod'22 if desired by means of links l Clisclpsed, but

,. refractory tile ating fins without the QBAattacliedto said rod and cooperating with rings 13. The-blocks supported in this mannerfmay be independently removed without destroying the whole arch each time it is vdesired to remove a single block. The various cooling pipes 11 may be joined in any suitable manner as by members connecting the upstanding ends 12 to provide for continuous circulation of water or other cooling medium through the entire roof.

The heat which is absorbed by the refractory tile 15 will be applied directly to the fins 14 and conducted by said fins to the main water cooled portion of the roof 10. Fins 14, being ofa material which is capable of conducting heat more readily than the commonly employed in furnace construction, operateto absorb the heat from the refractory tiles and to rapidly conduct the same to the main portion of the casting wherein it is taken up by the circulating Huid.'

Metallic fins 14 cool the surface'of the refractory bricksV much more readily than would be possible were the heat from the surface of the brick forced to pass through the entire depth of the brick and to be conducted therethrough to the cooling medium. Not only is the surface of the brick kept n comparatively cool conditionl by reason of Athe circulating fluid and by reason of its direct contact with the but the lower surface is facility since a large portion of the heat therefrom is absorbed directly by the -radinecessity of passing thrlough the entire layer of refractory materia Should it become necessary to remove a block from the furnace roof for purpose of repair or replacement, connecting members 13 may be removed from pipes 12 and the Water cooled blocks,

block lifted bodily from the arch by applying the` lifting force directly to rings 18. Supporting members 23 will then prevent the entire roof-from collapsing and serve to retain the remainder of the blocks in their proper position. In the drawings-accompanyingiand forming pat of this'speciflcation, a practical comme Fcial embodiment of the invention is as such' illustration is pricooled with greater.

marily for purposes of disclosure, it will be understood that the structure may be modified in various respects without departure from the broad spirit and scope of the invention as hereinafter defined and claimed.

What is claimed is: l 1. A block adapted to form a portion of a furnace roof comprising a metallic casting having radiating ns extending downwardly therefrom to substantially the inner surface of said roof, said fins of material having high heat conductivity being suitably spaced to permit the insertion of refractory tile therebetween and to conduct heat from the inner surface of said tile to said casting. Y

2. A block adapted to form a portion of a furnace roof comprising a metallic casting having pipes embedded therein for the circulation of cooling fluid, fins extending downwardly from said casting, said fins being suitably spaced to permit the insertion of refractory tile therebetween and to conduct heat from the inner surface of saidI naces comprising an exterior casting having pipes embedded therein for the circulation of a cooling fluid and internally extending metallic web members, refractory members between said web members adapted to form the lining of said furnace, said refractory material being held in position by the friction of the sides of said web members.

4. A furnace roof comprising a plurality of blocks, each of said blocks comprising a casting having internally extending heat absorbing fian es and refractory material between said gauges adapted to form the lining of said furnace and held in position by the friction thereof said fianges being adapted to remove heat from the surface of said material and to conduct said heat to the aforementioned casting.

5. A furnace roof comprising a plurality of blocks, each of said blocks comprising a water cooled casting having internally extending heat absorbing flanges integrally formed therewith and refractory material between said flanges adapted to form the lining of said furnace and held in position by the friction thereof, said flanges being adapted to remove heat from the surface of said material and to conduct said heat to the aforementioned water cooled blocks.

Signed at Garfield,in the county of Salt Lake and State of Utah. l

JOHN DOUGLAS MACKENZIE.

Signed at Garfield, in the county of Salt Lake and State of Utah.

RICHARD, W. SENGER.

llO 

